# H1 - Homework 1 ECE 403 Prof Bilbro Note H1 is due before...

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Homework 1 ECE 403 Prof. Bilbro Note: H1 is due before the lecture in class on Friday 1/16/09. 1) If the current flowing through the diode in this circuit follows the ideal Schockley model 1 T V V S IIe    =- with saturation current 1pA S I = and thermal voltage 25mV T V = , a) find the operating point current OP II = corresponding to 50mV OP VV == , where the subscript “OP” means “evaluated at the operating point” ; “operating point” is another synonym for “quiescent point” and “bias point”: they are interchangeable. b) find the small-signal conductivity OP I g V = and resistance 1/ rg = that relates any small change of current i to the corresponding small change of voltage v , at least for changes near the operating point ( OP V , OP I ). c) This small-signal resistance depends on the OP: what is r if the bias voltage is increased to 500mV=0.5V OP ? 2) Draw a C-S amp circuit using a passive load (i.e. pull up) resistor R d , n-channel MOSFET M, ideal input source V in , and supply voltage V dd . Assume that V dd =5V, R d =20k

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## This note was uploaded on 03/30/2009 for the course ECE 403 taught by Professor Bilbro during the Spring '08 term at N.C. State.

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H1 - Homework 1 ECE 403 Prof Bilbro Note H1 is due before...

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